RF CMOS power amplifier using a split inter-stage inductor for IEEE 802.11n applications

2016 ◽  
Vol 9 (4) ◽  
pp. 719-727 ◽  
Author(s):  
Minoh Son ◽  
Jinho Yoo ◽  
Inseong Kang ◽  
Changhyun Lee ◽  
Jihoon Kim ◽  
...  

In this study, we design a differential CMOS power amplifier using a 180-nm SOI RFCMOS process for 802.11n (64-QAM, 20 MHz bandwidth, 9.6 dB peak to average power ratio (PAPR)) applications. To minimize the chip area and mismatch in differential signals, we propose a layout method with an inter-stage matching network using a split inductor. By virtue of the symmetrical layout of the proposed split inductor, the mismatch in the differential signals is minimized, while the interconnection lines between the driver and power stages are shortened to minimize the overall chip area and the loss induced by the resistive parasitic components. The designed power amplifier is measured using a wireless local area network (WLAN) 802.11n signal to verify the feasibility of the proposed layout technique. The power amplifier achieved 20.34 dBm output power, while the measured EVM for the 802.11n applications is satisfied. From the measured results, we successfully prove the feasibility of the proposed power amplifier.

Jurnal INFORM ◽  
2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Walid Maulana Hadiansyah ◽  
Masfiyatul Hikmiyah ◽  
Yoedy Moegiharto ◽  
Ida Anisah

Teknologi Orthogonal Frequency Division Multiplexing (OFDM) telah banyak diimplementasikan dalam komunikasi digital berkecepatan tinggi seperti Wireless Local Area Network (WLAN), Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB), dan Asymmetric Digital Subscriber Line (ADSL). Salah satu kelemahan dari sistem OFDM adalah tingginya nilai Peak to Average Power Ratio (PAPR) yang menyebabkan terjadinya distorsi non linier pada High Power Amplifier (HPA). Akibatnya, terjadi penurunan efisiensi spektrum. Teknik reduksi PAPR yang digunakan pada karya tulis ini adalah teknik Selected Mapping (SLM) dan SLM Riemann. Hasil simulasi digambarkan dengan kurva Cumulative Complementary Distribution Function (CCDF) dan kurva efisiensi spektrum. Parameter yang digunakan yaitu jumlah subblok dan jumlah subcarrier. Pada penelitian ini, teknik SLM menghasilkan nilai PAPR sebesar 8.912 dB sedangkan teknik SLM Riemann menghasilkan nilai PAPR sebesar 9.099 dB. Sehingga teknik SLM dapat mereduksi nilai PAPR lebih baik dibandingkan dengan teknik SLM Riemann. Perbedaan jumlah subblok juga mempengaruhi kinerja teknik reduksi, teknik SLM dengan subblok 8 menghasilkan kinerja 0.5 dB lebih baik dibandingkan subblok 4. Sehingga kinerja akan semakin baik apabila jumlah subblok yang digunakan semakin banyak. Kemudian semakin banyak jumlah subcarrier maka nilai PAPR yang dihasilkan akan semakin besar. Selanjutnya, efisiensi spektrum meningkat seiring bertambahnya daya transmit. Teknik reduksi SLM dan SLM Riemann mampu meningkatkan daya transmit yang juga menyebabkan meningkatnya efisiensi spektrum. Penggunaan jumlah subblok yang lebih banyak akan meningkatkan efisiensi spektrum. Teknik SLM dengan subblok 4 menghasilkan efisiensi spektrum sebesar 0.425 bit/s/Hz dan subblok 8 menghasilkan efisiensi spektrum sebesar 0.444 bit/s/Hz. Teknik reduksi SLM memberikan hasil efisiensi spektrum yang lebih baik dari teknik reduksi SLM Riemann.


Author(s):  
Chaithra. H. U ◽  
Vani H.R

Now a days in Wireless Local Area Networks (WLANs) used in different fields because its well-suited simulator and higher flexibility. The concept of WLAN  with  advanced 5th Generation technologies, related to a Internet-of-Thing (IOT). In this project, representing the Network Simulator (NS-2) used linked-level simulators for Wireless Local Area Networks and still utilized IEEE 802.11g/n/ac with advanced IEEE 802.11ah/af technology. Realization of the whole Wireless Local Area Networking linked-level simulators inspired by the recognized Vienna Long Term Evolution- simulators. As a outcome, this is achieved to link together that simulator to detailed performances of Wireless Local Area Networking with Long Term Evolution, operated in the similar RF bands. From the advanced 5th Generation support cellular networking, such explore is main because different coexistences scenario can arise linking wireless communicating system to the ISM and UHF bands.


Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Heru Abrianto

Microstrip antenna which designed with dual feeding at 2.4 GHz and 5.8 GHz can meet WLAN (Wireless Local Area Network) application.Antenna fabrication use PCB FR4 double layer with thickness 1.6 mm and dielectric constant value 4.4. The length of patch antenna according to calculation 28.63 mm, but to get needed parameter length of patch should be optimized to 53 mm. After examination, this antenna has VSWR 1.212 at 2.42 GHz and 1.502 at 5.8 GHz, RL -13.94 dB at 2.42 GHz and -20.357 dB at 5.8 GHz, gain of antenna 6.16 dB at 2.42 GHz and 6.91 dB at 5.8 GHz, the radiation pattern is bidirectional. Keywords : microstrip antenna, wireless LAN, dual polarization, single feeding technique


2018 ◽  
Author(s):  
Kiramat

IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communications. Maintained by the Institute of Electrical and Electronics Engineers (IEEE) LAN/MAN Standards Committee (IEEE 802). This document highlights the main features of IEEE 802.11n variant such as MIMO, frame aggregation and beamforming along with the problems in this variant and their solutions


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